Geheyan dam
Encyclopedia
The Geheyan Dam is an arch-gravity dam
Arch-gravity dam
An arch-gravity dam, curved-gravity dam or arched dam is a dam with the characteristics of both an arch dam and a gravity dam. It is a dam that curves upstream in a narrowing curve that directs most of the water against the canyon rock walls, providing the force to compress the dam...

 on the Qingjiang River, a tributary of the Yangtze River
Yangtze River
The Yangtze, Yangzi or Cháng Jiāng is the longest river in Asia, and the third-longest in the world. It flows for from the glaciers on the Tibetan Plateau in Qinghai eastward across southwest, central and eastern China before emptying into the East China Sea at Shanghai. It is also one of the...

, in Hubei, China
People's Republic of China
China , officially the People's Republic of China , is the most populous country in the world, with over 1.3 billion citizens. Located in East Asia, the country covers approximately 9.6 million square kilometres...

.

The dam is located in Changyang Tujia Autonomous County
Changyang Tujia Autonomous County
Changyang Tujia Autonomous County is an autonomous county in Hubei Province, China. It is under the administration of the prefecture-level city of Yichang....

 (which is part of the prefecture-level city
Prefecture-level city
A prefectural level city , prefectural city or prefectural level municipality is an administrative division of the People's Republic of China, ranking below a province and above a county in China's administrative structure. Prefectural level cities form the second level of the administrative...

 of Yichang
Yichang
Yichang is a prefecture-level city located in Hubei province of the People's Republic of China. It is the second largest city in Hubei province after the province capital, Wuhan. The Three Gorges Dam is located within its administrative area, in Yiling District.-History:In ancient times Yichang...

), just a few kilometers to the west (upstream) from the county seat.

The dam is designed in 1987, and is equipped with a ship lift capable of lifting vessels of 300000 kg (661,386.8 lb) displacement. The dam played an important role in helping to ameliorate the impact of the 1998 Yangtze Floods
1998 Yangtze River Floods
The 1998 Yangtze River floods was a major flood that lasted from middle of June to the beginning of September 1998 in the People's Republic of China at the Yangtze River.-Tolls:The event was considered the worst Northern China flood in 40 years...

.

Power is generated by four units rated at each, totalling the installed capacity at .
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